Eight-sided spatial connection model is a teaching tool that assists in the training of solid geometry and spatial thinking. It consists of eight interconnected polygon modules (mostly equilateral triangles or squares), which can be fastened or magnetically attached to each other to construct various three-dimensional structures. In teaching, by concatenating different spatial forms, students can understand the logical composition of three-dimensional shapes, such as the spatial connections between vertices, edges, and faces. It can demonstrate the symmetrical structure of an octahedron, or disassemble and reassemble it into other composite geometries, visually presenting spatial transformations. Can cultivate students' three-dimensional spatial imagination, hands-on ability, and logical thinking.